Detecting method for defects of anchor cables based on strain monitoring technology
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摘要: 针对预应力锚索在长期运行条件下产生腐蚀、断口等缺陷的问题，基于应变体监测技术，通过对中部、左侧、右侧缺陷锚索的张拉试验和数值模拟试验，提出了一种确定锚索缺陷位置的理论方法。试验结果表明缺陷位置与应变之间存在关系，且数值模拟试验与物理试验结果、趋势基本相同；通过15组不同缺陷位置数值模拟试验拟合建立了锚索应变与缺陷位置的关系，为确定锚索缺陷位置提供了一种可行途径，也为预应力锚固工程的长期安全运行提供了技术支撑。Abstract: Aiming at the problems of defects suchas corrosion and fracture of prestressed anchor cables under long-term operation, a theoretical method to determine the defect location of anchor cables is proposed based on the strain monitoring technology and the numerical simulation tests on the middle, left and right defective anchor cables. The experimental results show that there is a relationship between the defect location and the strain, and the results and trends of the numerical simulation and physical tests are basically the same. The relationship between the cable strain and the defect location is established through 15 groups of numerical simulation tests on different defect locations. It provides a feasible way to determine the defect location of cables and also a technical support for long-term safe operation of prestressed anchorage engineering.
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表 1 左侧缺陷应变值
Table 1 Strain values in case of left defect
缺陷位置（右侧） 1号传感器/ με 2号传感器/ με 应变差/ με 右1 1.026×103 1.03×103 -4.07954 右2 1.026×103 1.03×103 -4.07966 右3 1.026×103 1.03×103 -4.08269 右4 1.026×103 1.03×103 -4.08071 右5 1.026×103 1.03×103 -3.97698 
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表 2 中部缺陷应变值
Table 2 Strain values in case of middle defect
缺陷位置（中部） 1号传感器/ με 2号传感器/ με 应变差/ με 中1 1.041×103 1.043×103 -1.3766 中2 1.042×103 1.043×103 -4.55766×10-1 中3 1.042×103 1.042×103 2.01399×10-2 中4 1.043×103 1.042×103 4.53554×10-1 中5 1.043×103 1.041×103 1.49256
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表 3 右侧缺陷应变值
Table 3 Strain values in case of right defect
缺陷位置（左侧） 1号传感器/ με 2号传感器/ με 应变差/ με 左1 1.043×103 1.039×103 3.78827 左2 1.043×103 1.039×103 3.82529 左3 1.043×103 1.039×103 3.82494 左4 1.043×103 1.039×103 3.82517 左5 1.043×103 1.039×103 3.82506
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